JavaScript Promises

JavaScript promises helps us to handle asynchronous operations more efficiently by assigning the handler with the success value or failure reason.

Intermediate

40 Lessons

12h

Certificate of Completion

JavaScript promises helps us to handle asynchronous operations more efficiently by assigning the handler with the success value or failure reason.

AI-POWERED

Explanations

AI-POWERED

Explanations

This course includes

69 Playgrounds

5 Quizzes

This course includes

69 Playgrounds

5 Quizzes

Course Overview

Promises are used to deal with event handling and callbacks in asynchronous programming in JavaScript, such as clicks and key presses. Promises allow developers to specify a function to execute at some later point in response to certain events. Promises may also indicate whether a certain code succeeded or failed in performing its assigned job. In this course, you will learn how to chain different promises, which makes the code easier to understand and debug. Next, you’ll learn built-in methods to monitor ...Show More

What You'll Learn

An in-depth understanding of JavaScript promises

An understanding of the asynchronous programming in JavaScript

Hands-on experience creating settled and unsettled promises

A working knowledge of chaining promises

Familiarity with monitoring and responding to promises executing in parallel

The ability to track unhandled rejections

What You'll Learn

An in-depth understanding of JavaScript promises

Course Content

Introduction

What’s This Course About?

Introduction to JavaScript Promises

Basics of Promises

Fundamentals of Promises Handlers Handlers Executed as Microtasks Unsettled Promises Settled Promises Non-Promise Thenables Summary: Basics of Promises Quiz: Basics of Promises

Chaining Promises

Fundamentals of Chaining Promises Promise Chains with the finally() Method Return Values in Promise Chains Return Promises in Promise Chains Return Promises from finally()Summary: Chaining Promises Quiz: Chaining Promises

Working with Multiple Promises

The Promise.all() Method When to Use the Promise.all() Method The Promise.allSettled() Method When to Use the Promise.allSettled() Method The Promise.any() Method When to Use the Promise.any() method The Promise.race() Method When to Use Promise.race()Summary: Working with Multiple Promises Quiz: Working with Multiple Promises

Async Functions and Await Expressions

Async Functions What Makes Async Functions Different?Await Expressions Await Expressions and Promises Await Expressions and Loops Summary: Async Functions and Await Expressions Quiz: Async Functions and Await Expressions

Tracking Down the Unhandled Rejections

5 Lessons

Conclusion

1 Lesson

Course Author

Trusted by 1.4 million developers working at companies

Anthony Walker

@_webarchitect_

Emma Bostian 🐞

@EmmaBostian

Evan Dunbar

ML Engineer

Carlos Matias La Borde

Software Developer

Souvik Kundu

Front-end Developer

Vinay Krishnaiah

Software Developer

Eric Downs

Musician/Entrepeneur

Kenan Eyvazov

DevOps Engineer

Anthony Walker

@_webarchitect_

Emma Bostian 🐞

@EmmaBostian

Hands-on Learning Powered by AI

See how Educative uses AI to make your learning more immersive than ever before.

Instant Code Feedback

Evaluate and debug your code with the click of a button. Get real-time feedback on test cases, including time and space complexity of your solutions.

AI-Powered Mock Interviews

Put your skills to the test in a simulated interview setting. Receive personalized feedback based on your performance. Available in Premium & Premium Plus plans.

Adaptive Learning

At various checkpoints throughout Educative courses, you will be prompted to take a quick assessment. Receive a condensed curriculum tailored to your strengths and skill gaps.

Explain with AI

Select any text within any Educative course, and get an instant explanation — without ever leaving your browser.

AI Code Mentor

AI Code Mentor helps you quickly identify errors in your code, learn from your mistakes, and nudge you in the right direction — just like a 1:1 tutor!

Looking for something else?